Originally Posted by jammerrs

whats the point of having dog engagment with helicalcut gears? Because helical cut gears are stronger and quieter. The only downside to helical is the side loadings and cost to produce.

being dog engagment will allow no clutch upshifts, and straight cut gears will mean less transmission loses and more wear. The whining noise from straight cut gears comes from the grinding of the teeth as the rotate and mesh together, although obviously this wear rate is reduced with toughened materials and good quality oils.

strictly speaking theres no such thing as semi helical as its either helical or straight buts its commonly reffered to, and is just a middle ground between them allowing less noise but taking more engine power